British carrier Vodafone warned iOS 6 users not to upgrade to iOS 6.1 due to 3G connectivity issues. A bug in the way iOS 6.1 handles meeting requests and management on Exchange servers has led some corporations to keep iOS 6.1 users out of their calendar functions, to avoid overloading the servers.

Bad iOS 6.1 battery life example.

Perhaps the bad iOS 6.1 battery life on the iPhone 4S and iPhone 5 is the biggest bug in iOS 6.1. The worst test case on a Gotta Be Mobile owned iPhone 4S saw battery life drop 45% with 2 hours of use and almost 5 hours on standby. Gotta Be Mobile writers also report battery life 10-15% lower than before iOS 6.1 on the iPhone 5.

If Apple is able to push iOS 6.1.1 live to end users in the coming weeks it will be one of the fastest iOS updates in recent memory. iOS 6.1 is only 14 days old, and the iOS 6.1.1 beta is only 5 days old. The iOS 6.1.1 beta release notes focus on Apple Maps upgrades in Japan, but it wouldn’t be surprising to see Apple include several bug fixes in this update.

Users experiencing very bad battery life may be able to fix bad iOS 6.1 battery life by backing up their iPhone and then restoring as a new iPhone before adding back apps and data.